A friend of mine has a late 90s Astro Van. Her mechanic says that the "chain in the transmission" is going bad. Thats what is causing it to jerk.
I know of no chain in transmissions unless its a FWD, or in a 4X4 transfer case--neight are tru in this case; its a stright two wheel, rear whell drive. Before i advise her to be cautious of this mechanic, I thought I'd ask you all, " Am I missing something"
It is also possible that she "misheard" the mechanic.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags